A Novel Model of Ultra-High-Frequency Microstrip Lines

Settapong Malisuwan, Ph.D.

Department of Electrical Engineering, Chulachomklao Royal Military Academy Nakhon-Nayok, Thailand

Manuscript received November 20, 2002,

Revised January 8, 2003




In this paper, a novel model of crosstalk in ultra-high-frequency microstrip transmission lines is proposed. Analogous to dielectric relaxation considerations of Cole-Cole diagrams as applied to dielectric materials, a “reactive relaxation” concept is introduced to represent the frequency-dependent characteristics of coupled microstrip lines. Relevant algorithms are useful in computer-aided circuit designs. Furthermore, the use of frequency-dependent Smith-chart deduced via microstrip-based Cole-Cole diagram representation is proved to be a method representing the frequency-dependent characteristics of microstrip lines. The present study demonstrates the feasibility of a cohesive presentation of the dispersion (lossy and lossless) characteristics of a microstrip structure via Cole-Cole diagram format, which is compatible for CAD efforts.



Keywords: Microstrip, Crosstalk, Debye Relation, Cole-Cole Diagram, Smith chart, and CAD


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